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The possibility of multi-band conductivity and multi-gap superconductivity isexplored in oriented V3Si thin films by means of reflectance and transmittancemeasurements at terahertz frequencies. The temperature dependence of thetransmittance spectra in the normal state gives evidence of two bandscontributing to the film conductivity. This outcome is consistent withelectronic structure calculations performed within density functional theory.On this basis, we performed a detailed data analysis and found that all opticaldata can be consistently accounted for within a two-band framework, with thepresence of two optical gaps in the superconducting state corresponding to2D=kTc values close to 1.8 and 3.8.

Multi-band conductivity and multi-gap superconductivity in V3Si from optical measurements on films at terahertz frequencies